Zonbu bills its EPEAT Gold-certified Zonbox (currently still in beta testing) as a zero-emission computer, based on its low energy use and the company's purchase of carbon offsets to fund green projects. This tiny Linux-based desktop PC comes with its own auto-updating OS and applications, and is designed to use just 10 percent of the power of a regular desktop PC, according to the company. The Zonbox costs $99 plus a monthly subscription fee that starts at $13 depending on the amount of storage (25GB to 100GB) you want. When you're done with the Zonbox, simply return it to Zonbu, which will recycle it for you.